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Summary: The example uses StyleSheet.create and also arrays-of-styles. I think this covers everything the old one did, but in simple-enough-for-the-basics form, so I removed the old one. I also reordered so that "Style -> Dimensions -> Layout" is the flow for learning "Styley" things. Closes https://github.com/facebook/react-native/pull/8379 Differential Revision: D3478384 Pulled By: caabernathy fbshipit-source-id: 158f0f0367c8eb8b2b24feda0d8d7a533fd7af4d
52 lines
2.2 KiB
Markdown
52 lines
2.2 KiB
Markdown
---
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id: basics-component-listview
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title: ListView
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layout: docs
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category: The Basics
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permalink: docs/basics-component-listview.html
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next: basics-network
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---
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On mobile devices, lists are a core element in many applications. The [`ListView`](/react-native/docs/listview.html#content) component is a special type of [`View`](/react-native/docs/basics-component-view.html) that displays a *vertically* scrolling list of changing, but similarly structured, data.
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`ListView` works best for possibly lengthy datasources (e.g., from an endpoint or database), where the number of items may not be known a priori.
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> Unlike the more generic [`ScrollView`](/react-native/docs/basics-component-scrollview.html), the `ListView` only renders elements that are currently showing on the screen, not all the elements at once.
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The `ListView` component requires two properties, `dataSource` and `renderRow`. `dataSource` is the source of information for the list. `renderRow` takes one item from the source and returns a formatted component to render.
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This example creates a simple `ListView` of hardcoded data. It first initializes the `dataSource` that will be used to populate the `ListView`. Each item in the `dataSource` is then rendered as a `Text` component. Finally it renders the `ListView` and all `Text` components.
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> A `rowHasChanged` function is required to use `ListView`. Here we just say a row has changed if the row we are on is not the same as the previous row.
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```JavaScript
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import React, { Component } from 'react';
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import { AppRegistry, ListView, Text, View } from 'react-native';
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class ListViewBasics extends Component {
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// Initialize the hardcoded data
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constructor(props) {
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super(props);
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const ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
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this.state = {
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dataSource: ds.cloneWithRows([
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'John', 'Joel', 'James', 'Jimmy', 'Jackson', 'Jillian', 'Julie', 'Devin'
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])
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};
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}
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render() {
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return (
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<View style={{paddingTop: 22}}>
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<ListView
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dataSource={this.state.dataSource}
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renderRow={(rowData) => <Text>{rowData}</Text>}
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/>
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</View>
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);
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}
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}
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// App registration and rendering
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AppRegistry.registerComponent('AwesomeProject', () => ListViewBasics);
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```
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